1971 MG Tire Fitment Guide

1971 MG vehicles use four sizes across two models. The MGB uses 165R14, 155R14, and 520-14, all of which mount on 14-inch wheels. The Midget uses 145R13, which mounts on a 13-inch wheel. Where rim-width guidance is published, 165R14 appears on wheels from 4.0 to 5.5 inches or 4.50 to 6.00 inches depending on the tire, 155R14 appears on 4.00 to 5.50 inches, 520-14 appears on 3.50 to 4.00 inches, and 145R13 appears on 4.00 to 5.00 inches.

That means year and make alone are not enough for a confident choice on a 1971 MG. MGB owners still need to choose among two radial sizes and one bias-ply size, while Midget owners should begin with 145R13. If the car already has wheels fitted, confirm both wheel diameter and width before committing, especially when moving between radial and bias-ply options on an MGB.

On a 1971 MG, 520-14 is a numeric bias-ply size. The 5.20 designation refers to the tire's nominal section width, written in older inch-based style, and the 14 identifies the wheel diameter in inches. It is not a modern metric radial code, and it does not decode the same way as 155R14 or 165R14. On 1971 MG applications, 520-14 belongs to the MGB rather than the Midget.

That size matters most to owners aiming for a traditional period look and bias-ply construction on an MGB. It also carries a narrower published rim-width range than the radial MGB sizes, so wheel width should be checked carefully before ordering. If your car currently wears a metric radial, do not assume 520-14 is a direct substitute without verifying the wheel and your desired driving character.

No, 1971 MG models do not use the same tire size. The MGB uses three different 14-inch sizes—165R14, 155R14, and 520-14—while the Midget uses 145R13 on a 13-inch wheel. The difference is both by model and, in the MGB's case, by construction type because 520-14 is bias-ply while 155R14 and 165R14 are radial.

For a buyer, that means the first question is whether the car is an MGB or a Midget, not simply whether it is a 1971 MG. Once the model is confirmed, the next step is matching the wheel diameter already on the car and deciding whether authenticity or a radial driving experience is the priority. That process avoids confusing the Midget's smaller fitment with the MGB's broader 14-inch choices.

For a 1971 MG MGB, the choice between 520-14 and a radial size is mainly a choice between bias-ply character and radial character. The 520-14 is the bias-ply option, while 155R14 and 165R14 are radial choices on the same 14-inch wheel diameter. Bias-ply construction aligns more closely with earlier period presentation, while radial construction is generally favored by owners who want a more modern-feeling response in normal road use.

If the car is being restored with authenticity in mind, 520-14 deserves serious consideration. If the MGB will spend more time on regular roads, many owners prefer one of the radial sizes and then choose between the narrower 155R14 and wider 165R14 based on wheel width and the look they want. Checking the actual wheel before moving between those paths is the smart final step.

1971 MG tires are available in two distinct sidewall directions depending on size. The radial sizes used on the MGB and Midget—165R14, 155R14, and 145R13—are available in Blackwall form. The 520-14 bias-ply MGB size appears in Narrow Whitewall form. That gives the 1971 MG range a clear split between understated sporting radial appearance and a more visibly styled bias-ply whitewall presentation.

For most British sports-car restorations and driver-focused presentations, Blackwall radials are the most natural visual fit. Narrow Whitewall 520-14 tires create a different look and should be chosen deliberately rather than by accident, especially on an MGB where both visual directions exist. Sidewall style is part of authenticity as much as size, so it is worth deciding how original or personalized you want the finished car to appear.

Several brands cover 1971 MG fitments. The 165R14 MGB size is available from Pirelli, Michelin, and Vredestein. The 155R14 MGB size is available from Michelin and Firestone, while the 145R13 Midget size is also available from Michelin and Firestone. The 520-14 MGB bias-ply size is available from Premium Sport.

That spread gives MGB owners the widest brand choice in 165R14, especially if a European-style radial is the target. Midget owners working in 145R13 have a smaller but still useful set of options, and buyers pursuing a bias-ply MGB restoration are really selecting among sidewall treatments within Premium Sport's 520-14 family. Brand matters, but size, construction, and sidewall appearance should still lead the decision.

Published rim-width guidance varies by size on 1971 MG applications. In 165R14, approved widths include 4.0 to 5.5 inches on one tire and 4.50 to 6.00 inches on another. In 155R14, approved width reaches 4.00 to 5.50 inches. In 520-14, the bias-ply fitment centers on 3.50 to 4.00 inches, and in 145R13 the published range reaches 4.00 to 5.00 inches.

Those ranges show why wheel width matters, especially on the MGB where several 14-inch sizes exist but do not share the same ideal wheel width. A wheel that works well with a 165R14 radial may not be the natural match for a 520-14 bias-ply. Before choosing a tire, measure the wheel or confirm the wheel specification so the tire sits correctly and keeps the handling character you expect.

Inner-tube status on 1971 MG tires depends on the exact size and product. Michelin versions of 165R14, 155R14, and 145R13 carry TL tubeless markings, while other products in those same sizes may not state tubeless the same way, so tube status varies by product. The 520-14 bias-ply products do not present a uniform tube marker across the range, which makes it especially important to check the specific tire and the wheel type being used.

The practical rule is to match the tire's sidewall marking and construction to the wheel you actually have rather than assuming every tire in a size uses the same setup. Original wire or steel wheel condition can also affect the final decision. If the car is being restored close to factory practice, a British marque specialist can help confirm what is appropriate for your wheel configuration.

The 14-inch MGB sizes all share the same wheel diameter, so they are compatible at the diameter level with original 14-inch MGB wheels. That includes 165R14, 155R14, and 520-14. The important difference is wheel width, because the published ranges for those sizes are not identical. The 520-14 bias-ply option is notably narrower in its approved wheel-width range than the radial alternatives.

In practice, that means an original 14-inch MGB wheel may accept more than one tire size, but the right answer depends on the exact wheel width on the car. Owners moving from a radial MGB setup to a 520-14 bias-ply restoration tire should verify wheel width first instead of assuming every original wheel is equally suitable. Diameter compatibility is only the beginning of a proper fitment check.

A stored 1971 MG should be kept in a cool, dry, dark space away from direct sunlight, electric motors, battery chargers, welders, and other ozone-producing equipment that can age rubber. Clean, dry tires hold up better than tires left in standing moisture or on oil-stained concrete. Bias-ply tires such as the MGB's 520-14 are also more prone to temporary flat-spotting during long stationary periods than the radial options used on the MGB and Midget.

If the car will sit for extended stretches, raise the pressure to a storage level within the tire maker's guidance, move the car occasionally, or use stands so one patch of tread is not carrying the load for months at a time. A fitted car-cover garage strategy helps the whole vehicle, but tire-friendly storage habits are especially important on low-mileage collector sports cars.

On a 1971 MG, age usually matters more than mileage. Collector tires often look usable long after the rubber has begun to harden, so a general evaluation window of about five to seven years is sensible, with replacement becoming a serious consideration around ten years regardless of tread depth. The DOT date code, visible on the sidewall, is the best starting point for understanding a tire's actual age.

That matters because many MGs cover very few miles each season and can fool owners into thinking a tire is still fresh simply because the tread is deep. A lightly used roadster or coupe can still be riding on old rubber with diminished grip and increased cracking risk. Age, storage history, and inspection condition should weigh more heavily than mileage alone when planning replacement.

Tires on a 1971 MG should be inspected before every drive and again before any longer outing. Look for sidewall cracking, tread separation, cuts, bulges, uneven wear, and signs that the tire has been losing pressure between uses. On any setup where tube use is part of the final installation, valve stems and tube-related air retention deserve the same attention as the outer casing.

Frequent inspection makes extra sense on an older British sports car because the vehicle may sit for weeks between drives and then return directly to road speeds without much warning. A quick walk-around catches issues before they become a roadside problem. If steering feel changes, the car pulls, or one tire looks lower than the rest, stop and investigate before continuing.

A 1971 MG MGB falls in the era when bias-ply and radial thinking overlapped, and the fitments associated with the car today reflect that transition. The MGB uses 14-inch tire sizes and appears with both 520-14 bias-ply and 155R14 or 165R14 radial options. That does not make every combination universally original for every market or build, but it does place the MGB squarely in a period where construction type is part of the authenticity discussion.

Owners pursuing strict factory-correct restoration should confirm market-specific and production-specific practice through marque clubs, factory literature, and restoration guides before finalizing a tire. For many enthusiasts, the key is choosing whether the car should present as an authentic period sports car on bias-ply rubber or as a later-period driver on an era-appropriate radial. Sidewall style is part of that choice as well.

Correct tire fitment can matter a great deal when a 1971 MG is judged for originality. Size, construction, and sidewall appearance all affect whether the car looks period-appropriate, and judges or knowledgeable enthusiasts will often notice a mismatch between a car's restoration theme and its tires. On a 1971 MG, that question is especially visible on the MGB because both bias-ply and radial directions exist within the year's fitment range.

A car restored for concours or marque-level events should use tires that align with the event's expectations for authenticity, not just what physically fits the wheel. A modern-looking radial on a car presented as factory-original can draw the wrong kind of attention, just as an unusual whitewall treatment can shift the car away from a correct sporting appearance. Event-specific judging standards are best confirmed with MG clubs and show organizers.

For a 1971 MG MGB in 165R14, both Michelin XAS and Vredestein Sprint Classic are radial Blackwall tires with H speed rating to 130 mph. The Michelin XAS is marked 165HR14 84H TL and carries a published rim-width range of 4.50 to 6.00 inches, while the Vredestein Sprint Classic carries a published range of 4.0 to 5.5 inches and a max load figure of 1,102 pounds at 51 psi. Their physical fitment overlap is strong, but the published wheel-width windows are not identical.

That makes wheel width one of the most useful tie-breakers when choosing between them on an MGB. Owners with wider 14-inch wheels may appreciate the Michelin's broader upper rim-width allowance, while those staying closer to traditional narrower wheels may find the Vredestein range aligns neatly. Since both stay within a classic European radial theme, the final choice often comes down to wheel specification and the exact character you want the car to present.

1971 MG tires can be suitable for highway driving when the tire is in good condition, correctly matched to the wheel, and used within its published speed capability. Among the sizes here, H-rated examples carry a ceiling of 130 mph and the T-rated 155R14 example carries a ceiling of 118 mph. Those numbers are well above normal U.S. highway speeds, although the car's age, braking system, suspension condition, and alignment often matter more than the tire's rating in real-world classic-car use.

The more important question is whether the tire is fresh, properly inflated, and appropriate for the way the car is driven. A sound radial on a healthy MGB or Midget will feel different from a bias-ply tire, but either can be serviceable when chosen with realistic expectations and used responsibly. Any vintage MG headed onto faster roads should have its full chassis and braking condition assessed, not just its tires.

Inflation pressure on a 1971 MG should be matched to the exact tire size, the specific tire's sidewall information, and the vehicle manufacturer's recommendations for the model. Published load-and-pressure figures include 1,102 pounds at 51 psi for one 165R14 radial, 990 pounds at 44 psi for one 155R14 radial, 1,230 pounds at 60 psi for 520-14 bias-ply examples that carry that marking, and 825 pounds at 44 psi for one 145R13 radial. Those figures are load capacities at stated maximum pressures, not a blanket instruction to run every MG at those pressures.

For actual road use, start with the original owner's manual or factory placard guidance for your MGB or Midget, then confirm that approach against the tire manufacturer's sidewall and product guidance. Do not transfer a pressure recommendation from a 14-inch MGB tire to a 13-inch Midget tire, or from a radial to a bias-ply, just because both belong to a 1971 MG. Pressure tuning should always follow the exact size and construction on the car.

Before a longer drive in a 1971 MG, inspect each tire for cracking, tread damage, bulges, exposed cords, uneven wear, and signs of pressure loss. Check cold inflation pressure, make sure the spare is usable, and look closely at valve stems and any tube-related components if the final installation uses them. On the MGB, also confirm that the car is wearing the intended 14-inch size and construction; on the Midget, confirm the 13-inch setup is in place and in good condition.

A pre-drive tire check should sit alongside a broader classic-car review that includes brakes, wheel bearings, fluids, cooling, and lighting. MGs are rewarding long-distance companions when sorted, but they are still half-century-old machines that benefit from deliberate preparation. Taking ten minutes to check the tires before departure can prevent the most common age-related problems from turning into a roadside interruption.